1. Aim: How does your body maintain homeostasis?
Unit 3: Homeostasis
Aim: How does your body maintain homeostasis?

2. What is Homeostasis? Homeostasis is the regulation and maintenance of the internal environment of the body

3. Why is it important for you body to maintain homeostasis
Why is it important for you body to maintain homeostasis? Conditions within the body must remain within a narrow range – like your body temperature- in order for your body to function properly.
a. Homeostasis involves keeping the internal environment within set ranges

4. How does your body maintain homeostasis?
pore
sweat
glands
hair
follicle
muscle
goose
bump
Through a control system.
a. Sensory cells: gather data
b. Brain: control center receives data, sends messages
c. Spinal cord/nerve cells: communication system delivers messages to target organs, tissues
d. targets: respond to change

5. a. Negative feedback loops are necessary for homeostasis
What is negative feedback?
a. Negative feedback loops are necessary for homeostasis
Feedback compares current conditions to set ranges.
Negative feedback stops the change

6. b. Negative Feedback Example:
3. O2 / CO2 level returns to normal
1. You holding breath, your
CO2 levels rise
2.Control system forces you to exhale, inhale

7. c. Positive feedback increases change
Example: Torn blood vessel stimulates release of clotting factors
platelets
fibrin
white blood cell
red blood cell
blood vessel
clot
growth hormones stimulate more cell division

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Complete Homeostasis Assignment # 1